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[1] Rules

[2] Christian A. Volf strange concept

[3] Large VTOL Flying boat

[4] Spanish Patents

[5] Dornier Patents

[6] Daimler-Benz Strange Airplane of 1943-1950

[7] Otto Muck Tailsitter Patent 1938

[8] Frank M. Bellanca Odd Airplanes

[9] Sikorsky aircraft

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